O-alkyl-O-pyrazolopyrimidine-thiono-phosphoric acid ester amides

ABSTRACT

IN WHICH R is an alkyl radical with 1 to 6 carbon atoms, R1 is hydrogen or halogen, and R2 and R3 each independently is hydrogen or methyl, WHICH POSSESS INSECTICIDAL AND ACARICIDAL PROPERTIES.   O-Alkyl-O-pyrazolopyrimidine-thiono-phosphoric acid ester amides of the formula

United States Patent [1 1 Ciilln et al.

[ Dec. 16, 1975 O-ALKYL-O-PYRAZOLOPYRIMIDINE- THIONO-PHOSPHORIC ACID ESTER AMIDES [75] Inventors: Reimer Ciilln, Wuppertal; Ingeborg Hammann, Cologne, both of Germany [73 Assignee: Bayer Aktiengesellschaft,

Leverkusen, Germany 22 Filed: on. 17, 1974 21 Appl. No.: 515,795

[30] Foreign Application Priority Data Primary Examiner-Leonard Schenkman Attorney, Agent, or Firm-Burgess, Dinklage &

Sprung [57] ABSTRACT OAlkyl-O-pyrazolopyrimidine-thiono-phosphoric acid ester amides of the formula in which R is an alkyl radical with 1 to 6 carbon atoms, R is hydrogen or halogen, and R and R each independently is hydrogen or methyl, which possess insecticidal and acaricidal properties.

74Claims, No Drawings O-ALKYL-O-PYRAZOLOPYRIMlDlNE-THIONO- PHOSPHORIC ACID ESTER AMlDES The present invention relates to and has for its obpled with very low toxicity to warm-blooded animals. than the corresponding previously known compounds of analogous structure and of the same type of action. The products according to the present invention thus jects the provision of particular new O-alkyl-O- 5 represent an enrichmem of the an P 'f '9 f esier i The invention also provides a process for the prepawhich P "S 9 P P ration of an ,O-pyrazolopyrimidine-thiono-phosphoric ac ive compositions m the form of mixtures of c acid ester-amide of the formula (I) in which an compounds with solid and llquid dlspel'slble earner alkvlthiono-phosphoric acid ester dihalide of the genvehicles. and methods for producing such compounds f l and for using such compounds in a new way especially for combating pests. e.g. insects and acarids. with other and further objects. becoming apparent from a study of r s Hal the within specificationand accompanying examples.

lt is known from German Published Specification No. RO i 2.131.298 that O-pyrazolopyrimidine-thiono-phos- Hill phoricacid ester amides. .for example O-ethyl-N.N- dimethyl-O-[pyrazolo-( l.5-a)-pyrimidin-('2)yl]- i (Compound A) or -O-[3-chloropyrazolo-( l.5-oz)- 7 reacted i z'hydroxypyl'uzolopyrlmldme derivapyrimidin-(2)yll-thiono-phosphoric acid ester (Com- W of the general formula pound B) exhibit a pesticidal. in particular an insecticidal and acaricidal. action.

The present inventionjprovides O-pyrazolopyrimi- H0 dine-thiono-phosphoric acid ester-amides of the genas eral 'formula (I in which formulae 1 (I) R, R, R and R" have the above-mentioned meanings and 1 v Hal is a halogen atom, preferably a chlorine atom. in the presence of an acid'acceptor or in the form of an alkali metal salt. alkaline earth metal salt or ammonium salt. and" the O-alkyl-O-pyrazolopyrimidine-thionophosphoric acid diester-halide thus obtained is reacted in which 40 with ammonia in the presence of an acid acceptor.

R is an alkyl radical with l. to 6 carbon atoms. The O-alkyl-O-pyrazolopyrimidine-thiono phos- I R IS hydrogen or halogen, and phorlc acid dlester halide derivative obtained in the E and?! each independiently its, hydrhogdenl or metnyl.l 1 82st stage olzlthe iprocess need not be isolated before re era y 18 a straig t or ranc e ower a y mg reacte wit ammonia. radical'with l to 4 carbon atoms, and R is hydrogen, If. 'for example. O-ethyl-thiono-phosphoric acid ester chlorine or bromine. v v dichloride, 2-'hydroxy-pyra zolo-( l,5-a )-p yrimidine and Surprisingly. the Q-pyrazolopyr mldrne-thiono-phosammonia are used asstartmg compounds. the course of phonc acid ester-amides accordmgto the invention the reactions accord ng to the invention can be repreposs'ess a better insecticidal and acarlcidal'action, cousented by the following formula scheme:

s 01 no Acid ll 2 5 m accep or (IIIa) 235 Acid m acceptor 9 3 ncl The O-alkyl-thiono-phosphoric acid ester dihalide (H) to be used as starting compounds are known and can be prepared in accordance with known processes. for example according to US. Pat. Specification No. 3.005.005. The 2-hydroxypyrazolo-( l.5-a)-pyrimidine derivatives III) are also known and can be prepared by known processes such as described in German Published Specification NO. 2.131.298. Belgian Patent Specification No. 769.702 and Annalen 647 (l96l) pages l l7-l-l4.

The following are individual examples of O-alkylthiono-phosphoric acid ester dihalides (ll): O-methyl-. O-ethyl-. O-n-propyl-. O-iso-propyl. O-n-butyl-. O-sec.- butyl-. O-iso-butyland Q-tert;-butyl-thionophosphoric acid ester dichloride or dibromide.

The following are "individual examples of the pyrazolopyrimidine derivatives lll 2-hydroxypyrazoIo-( l.5-a)-pyrimidine and 2-hydroxy-3-chloroand -3-bromo-. -3-chloro-7-methyl-. -3-bromo-7-methvl-. -3-chloro-5.7-dimethyl-.' -3-bromo-5.7-dimethyl-. -5.7-dimethyl-. and -7-methyl-pyrazol0-( l.5-a)-pyrimidine. 1

The reaction according'to the invention for the prep aration of the new compounds l) is preferably .carried out in the presence of a solvent. which term includes a mere diluent. Practically all inert organic solvents can be used for this purpose; preferred solvents including aliphatic and aromatic optionally chlorinated hydrocarbons. such as benzenegtoluene. xylene. benzine. methylene chloride. chloroform. carbon tetrachloride and chlorobenzene; etliers. such as diethyl ether, dibu-z tyl ether and dioxane; ketones. such as acetone. methyl ethyl ketone. methyl isopropyl ketone and methyl isobutyl ketone: and in particular nitriles. such as acetonitrile and propionitrile.

All customary acid-binding agents fcan be used as acid acceptors. Alkali metal carbonates and alkali metal alcoholates. such as sodium carbonate and potassium carbonate. sodium methylate and potassium methylate and sodium ethylate and potassium ethylate. have proved particularly successful. as have aliphatic.) aromatic or heterocyclic amines. for example triethylamine. trimethylamine. di'methylaniline, dimethylbenzylamine and pyridine.

The reaction temperature can be varied within a wide range. In general. the reaction is carried out at to 100. preferably at 0 to C.

In general. the reaction is carried out under normal pressure. i

In carrying out the process. the O-alkyl'thionophosphoric acid ester dihalide and the Z-hydroxypyrazolopyrimidine component may be employed in equimolar ratios. while the ammonia is preferably added in 10% excess. in the'form of a concentrated aqueous solution. The reaction is preferably carried out LII in the presence of one of the abovementioned solvents and in the presence of an, acid acceptor. at the indicated temperatures. The "reaction mixture may be stirred further and between one and several hours and may then be mixed with water. and the-crystals may be filtered off and purified in the usual manner. for example by washing. drying-and/or recrystallization.

The compounds according to the invention are obtained in crystalline form. They are characterized by their melting points.

As has already been mentioned. the new -O- pyrazolopyrimidine-thiono-phosphoricacid esteramides are distinguished by an outstanding insecticidal and acaricidal activity coupled with only slight toxicity towards warm-blooded animals. They possess a good action against both sucking and biting insects and mites (Acarina). I I

For these reasons. the products according to the invention may be employed successfully as pesticides in plant protection and the protection ofstored products. and in the hygiene field.

To the sucking insectsthere' belong. in the main. aphids (Aphididae) such as the green peach aphid (Myzus persicue). the bean aphid (Duralis fabue), the bird cherry aphid (R/zopulosip'hum padi). the pea aphid (Mucrosip/zum pisi) and the potato aphid (Macrosiplmm sulanifnlii). the currant gall aphid (Cr \'pmm rzus korsclzelri). the rosy apple aphid (Sappup/iis mall). the mealy plum" aphid (H \alr)pterus arundinis) and the cherry black-fly (Myzus cerasi); in addition. scales and mealybugs (Coccina). for example the oleander scale (Asp idioms l ederae and the soft scale Lecunium hespria'uml as well as the grape mealybug Rs'eudacoccus muritimus); thrips (Thysanoptera). such as Hercindthrips femorulis. and bugs. for example the beet bug (Piesma quudrata). the red cotton bug (D \'.s'd'rcu.s' intermedizis). the bed bug (Cimex lectulurius).,the assassin bug (R/iodnius prolixus) and Chagas' bug (Triatoma iizfestans) and. further. cicadas. such as Euxcelis bilubams and Nephotettix bipum'tatus.

In the case of the biting insects. above all there should be mentioned butterfly caterpillars (Lepidoptera) such as the diamond-back moth Plate/la maculipennis). the gypsy moth (L \'muntria dispur). the browntail moth (Eupructis (/lI' \.YOIr/l()tl) and tent caterpillar (Malacosoma neustria); further. the cabbage moth (Mamestra brassicae) and the cutworm (Agrotis segemm the large white butterfly (Pieris brassicae). the

. small winter moth (Cheimatobia brumam). the green Also to be classed with the biting insects are beetles (Coleoptera). for example the granary weevil (Silop/zilus granuriux Culamlra granuriu). the Colorado beetle (Leplinotmzs'a decemlineutu). the dock beetle (Gastmp/zysu i'iridulu). the mustard'beetle (P/zucdun cuclzleariue). the blossom beetle (lWllflI/ILS uencus). the raspberry beetle (Byrurus tomenmsus), the bean' weevil (Bruchidius Acanrlzoscelides obrecrus), the leather beetle (Dermextes frisclu'), the khapra beetle (Trogoderma grz mnrirrm). the flour beetle (Tribolium casteneum). the northern corn billbug (Calandra or Simpliilus :eamais), the drugstore beetle (Stegohium panic-earn), the yellow mealworm (Tenebrio. rrioliror) and the saw-toothed grain beetle (Oryzaep/xilus surinamensis), and also species living in the soil, for example wireworms (Agriotes spec.) and larvae of the cockchafer Melolont/za melolonr/m); cockroaches, such as the German cockroach (Blattella germanica), American cockroach (Periplaneta americaizu); Madeira cockroach (Leucop/zaea or R/rvpambia maderue), oriental cockroach (Blalta orienmlz's), the giant cockroach (Blaberus giganteus) and the black giant cockroach (Blaberus fuscus) as well as Hensclzoutedenia flexirilta: further. Orthoptera. for example the. house cricket (Gryllus domesticus); termites such as the eastern substerranean termite (Reticulirermesflaripes) and Hymenoptera such as ants, for example the garden ant (Lusius niger).

The Diptera comprise essentially the flies. such as the vinegar fly (Drosop/zila melanogasrer). the Mediterranean fruit fly (Ceratilis capitata), the house fly (Musca domestica), the little house fly (Fannia canicularis), the black blow fly (P/mrmiu regina) and bluebottle fly (Cal-v liphora er \'tlzroceplzala) as well as the stable fly (Stomoxys culcirrans); further, gnats. for example mosquitoes such as the yellow fever mosquito (Aedes aegypti the northern house mosquito (Cu/ex pipiens) and the malaria mosquito (Anopheles steplzensi). I

With the mites (Acari) there are classed. in particular, the spider mites (Tetranychidae) such as the twospotted spider mite (Tetranychus urricae) and the European red mite (Paratetranychus pilosus Panorrvc/zus ulmi), gall mites, for example the blackcurrant gall mite (Eriop/rves ribis) and tarsonemids, for exampple the broad mite (Hemirarsonemus Iatus) and the cyclamen mite (Tarsonemus pallidus); finally, ticks, such as the relapsing fever tick (Omit/iodorus moubatz).

When applied against hygiene pests and pests of stored products, particularly flies and mosquitoes, the process products are also distinguished by an outstanding residual activity on wood and clay, as well as a good 'stability to alkali on limed substrates.

The active compounds according to the instant invention can be utilized. if desired, in the form of the,

usual formulations or compositions with conventional inert (i.e. plant compatible or herbicidally inert) pesticide diluents or extenders, i.e. diluents, carriers or extenders of the type usable in conventional pesticide formulations or compositions. e.g. conventional pesticide dispersible carrier vehicles such as gases,. solutions. emulsions, suspensions, emulsifiable concentrates, spray powders, pastes, soluble powders, dusting agents, granules, etc. These are prepared in known manner, for instance by extending the active compounds with conventional pesticide dispersible liquid diluent carriers and/or dispersible solid carriers optionally with the use of carrier vehicle assistants, e.g, conventional pesticide surface-active agents. including emulsifying agents and/or dispersing agents, whereby. for example, in the case where water is used diluent. organic solvent may be added as auxiliary solvent. The following may be chiefly considered for use as conventional carrier vehicles for this purpose: aerosol propellants which are gaseous at normal temperatures and pressures. such as Freon; inert dispersible liquid diluent carriers, including inert organic solvents. such as aromatic hydrocarbons (e.g. benzene, toluene. xylene. alkyl naphthalenes. etc. halogenated, especially chlorinated. aromatic hydrocarbons (e.g. chlorobenzenes. etc). cycloalkanes (e.g. cyclohexane. etc). paraffins (e.g. pertroleum or mineral oil fractions), chlorinated aliphatic hydrocarbons (e.g. methylene chloride. chloroethylenes. etc.). alcohols (e.g. methanol. ethanol. prop-anol. butanol. glycol. etc.) as well as ethers and esters thereof '(e.g. glycol monomethyl ether. etc). amines (e.g. ethanolamine. etc. amides (e.g. dimethyl formamide. etc-.), sulfoxides (e.g. dimethyl sulfoxide. etc). acetonitrile. ketones (e.g. acetone. methyl ethyl ketone methyl isobutyl ketone. cyclohexanone, etc.), and/or water; as well as inert dispersible finely divided solid carriers. such as ground natural minerals (e.g. kaolins. clays. alumina. silica. chalk. i.e. calcium carbonate. talc. attapulgite. montmorillonite. kieselguhr. etc.) and ground synthetic minerals (e.gv highly dispersed silicic acid, silicates. e.g. alkali silicates. etc.); whereas the following may be chiefly considered for use as conventional carrier vehicle assistants. e.g.v surface-active agents. for this purpose: emulsifying agents. such as nonf'ionic and/or anionic emulsifying agents (e.g. polyethylene oxide esters of fatty acids. polyethylene oxide ethers of fatty alcohols, alkyl sulfates. alkyl sulfonates. aryl 'sulfonates, albumin hydrolyzates. etc.. and especiallyalkyl arylpolyglycol ethers. magnesium stearate. sodium oleate, etc. and/or dispersing agents, such as lignin, sulfite waste liquors, methyl cellulose. etc.

Such active compounds may be employed alone or in the form of mixtures with one another and/or with such solid and/or liquid dispersible carrier vehicles and/or with other known compatible active agents, especially plant protection agents, such as other insecticides and acaricides, or rodenticides, fungicides. bactericides. nemxtocidesy'herbicides, fertilizers. growth-regulating agents, etc.. if desired, or in the form of particular dosage preparations for specific application made therefrom. such as solutions, emulsions, suspensions powders, pastes, and granules which are thus ready for use.

As concerns commercially marketed preparations, these generally contemplate carrier composition mixtures in which the active compound is present in an amount substantially between about 01-95% by weight, and preferably 05-90% by weight. of the mixture, whereas carrier composition mixtures suitable for direct application or field application generally contemplate those in which the active compound is present in an amount substantially between about 0.000 1-1071 preferably 0.014%. by weight of the mixture. Thus. the present invention contemplates over-all compositions which comprise mixtures of a conventional dispersible carrier vehicle such as (l) a dispersible inert finely divided carrier solid. and/or (2) a dispersible carrier liquid such as an inert organic solvent and/or water preferably including a surface-active effective amount of a carrier vehicle assistant, e.g. a surface-active agent, such an emulsifying agent and/or a dispersing agent. and an amount of the active compound which is effective for the purpose in question and which is generally between about 0.000l-95%, and preferably 0.0l957c. by weight of the mixture.

The active compounds can also be used in accordance with the well known ultra-low-volume process with good success. i.e. by applying such compound if normally a liquid. or by applying a liquid composition containing the same. via very effective atomizing equipment. in finely divided form. e.g. average particle diameter of from 50-100 microns. or even less. i.e. mist form. for example by airplane crop spraying techniques. Only up to at most about a few liters/hectare are needed. and often amounts only up to about 15 to 1000 g/hectare. preferably 40 to 600 g/hectare. are sufficient. In this process it is possible to use highly concentrated liquid compositions with said liquid carrier vehicles containing from about 20 to about 95% by weight of the active compound or even the 100% active substance alone, e.g. about 20l00% by weight of the active compound.

Furthermore. the present invention contemplates methods of selectively killing. combating or controlling pests. e.gv insects and acarids. which comprises applying to at least one of correspondingly (a) such insects. (b) such acarids. and (c) the corresponding habitat thereof. i.e. the locus to be protected. e.g. to a growing crop. to an area where a crop is to be grown or to a domestic animal. a correspondingly combative or toxic amount. i.e. an insecticidally or acaricidally effective amount. of the particular active compound of the invention alone or together with a carrier vehicle as noted above. The instant formulations or compositions are applied in the usual manner. for instance by spraying. atomizing. vaporizing. scattering, dusting. watering. squirting. sprinkling. pouring. fumigating. dressing. encrusting. and the like.

It will be realized. of course. that the concentration of the particular active compound utilized in admixture with the carrier vehicle will depend upon the intended application. Therefore. in special cases it is possible to go above or below the aforementioned concentration ranges.

The unexpected superiority and outstanding activity of the particular new compounds of the present invention are illustrated. without limitation. by the following examples:

EXAMPLE 1 Plutella test Solvent: 3 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether To produce a suitable preparation of active compound. 1 part by weight of the active compound was mixed with the stated amount of solvent containing the stated amount of emulsifier and the concentrate was diluted with water to the desired concentration.

Cabbage leaves (Brussica oleracea) were sprayed with the preparation of the active compound until dew moist and were then infested with caterpillars of the diamond-back moth Plate/1a muculipennis).

After the specified periods of time. the degree of destruction was determined as a percentage: 100% means that all the caterpillars were killed whereas means that none of the caterpillars were killed.

The active compounds. the concentrations of the active compounds. the evaluation times and the results can be seen from the following Table l:

Tabl e l l nsoc s whic h damage plan 0 s Plutel la test A: t i ve compounds A: t i ve Degr es of c ompou ad (has 0 rue I i on c one on in a 1 'er trot ion 3 days in C H O n j 0. 1 75 2 5 N o 01 0 (CH N A (known) N c H o 5 0.1 100 1 5 l l l 0 P-Q-N,N\.. 0.01

(known) (B) s F-l i H o 0.1 100 n 3 l 0.01 100 5 J 0.1 100 l 0.01 100 H N/ 3 40 0.1 100 c 11 o l| s 0.01 100 P- /w 0.001 95 2N CH3 s o 1 100 -c H o 5 C l 5 H o s T=f-i 0.1 100 c 0.01 100 a l -o/' cl N s 0.1 100 c 11 o\ 0.01 90 P-o 'H N c14 (2) 3 ,9 26,998 9 l l'gw (continued) LG hm (continued) Active Ativ0 :o|np0u'nds compound D99". cl Active compounds Active Dlgroe of I cong :hslruclion o|npound destruction "0H0" 111% tanconin in 1 char 3 Motion after 1 day ay s in 1,

CH3 0 1 100 s 2 5 i' l 0.01 100 "-a"1 L i l 0.1 100 \P-OININ\9' H) W loo 7) 0 .001 75 14 M ca 3 1 2) c H o s lNlV/ CH3 0.] 00 N 0.01 95 3 \\N,N\.- CH 0 5 l l 0.1 100 v P-o 3 \ll 0.01 100 H2" CH3 (l0) P-U l I H2N H N CH 0) 3 0.1 100 -1 c n 0 l 0 01 90 s N I N lko N 5 I (2,150 N I 0.1. 100

n u cu EXAMPLE 2 35 (a Myzus test (contact action) Solvent: 3 partsby weight-of acetone N Emulsifier: 1 part bywelight of alkylaryl polyglycol c H o s i o I we ether v V 3 7 /.\\NN\. 0.0] 00 To produce a suitable preparation of active compound. 1 part by weight of the active compound was mixed with the stated-amount of solvent containing the 1 stated amount of emulsifier and the concentrate was diluted with water to the desired concentration.

Cabbage plants '(Brqssic'a oleracea) which had been 5 i' 3'2 :23 heavily infested with peach aphids (Myzus persicue) "a l n /7 were sprayed with the preparation of the active com- H N/ cu pound until dripping wet. 2

After the specified periods of time, the degree of 40 (9) destruction was determined as a percentage: 100% means that all the aphids were killed whereas 0% means that none of the aphids were. killed.

'The active compounds, the concentrations of the EXAMPLE 3 active compounds, the evaluation times and the results can be seen from the following Table 2:

Table 2 (lnsoc s whicl damugc plants) Myzus t'os t- A: t i vo compounds Tetranychus test (resistant) Solvent: 3 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether .To produce a suitable preparation of active compound, 1 part by weight of the active compound was mixed with the stated amount of solvent containing the stated amount of emulsifier and the concentrate was diluted with water to the desired concentration.

Bean plants (Phaseolus rulgaris), which had a height of approximately 10 30 cm, were sprayed with the preparation of the active compound untildripping wet. These bean plants were heavily infested with the'common or twospotted spider mite (Terranyc/ms urn'cae) in all stages of development. 1

After the specified periods of time. the effectiveness of the preparation of active compound was determined by counting the dead mites The degree of destruction thus obtained was expressed a percentage:

means that all th spidermites were killed whereas 0% means that none of the spider mites were killed.

The active compounds. the concentrations of the active compounds. the evaluation times and the results can be seen from the following Table 3:

Tobie 3 (Mites which damage plant 5 Tairanychus 'osi (res i s tunt i A solution of H04 g (0.8 mole) of potassium carbonate in 180 g of water was added dropwise to a mixture of 59.5 g (0.4 mole) of 2-hydroxy-7-methyl- ,pyrazolo-( l.5-a)-py'rimidine. 320 g of acetone and 77.2 g (0.4 mole) of O-n-propyl-thiono-phosphoric acid ester dichloride while stirring and cooling at 0 to 5C. The reaction mixture was stirred for a further two hours in an ice water bath. 0.44 Mole of ammonia in the form of a concentrated aqueous solution was then added dropwise. while keeping the internal temperature at 20C by means of external cooling. After further brief stirring at 20C. the reaction mixture was mixed with 1.2 liters of cold water and the crystals were filtered off. washed with water and dried in a vacuum desiccator. Recrystallization of the dried product from a two-fold amount of toluene gave 68.7 g (60% of theory) of 0-11-propyl- O- 7-methyl-pyrazolo-( 1 .5-00- pyrimidin( 2)-yl]-thionophosphoric acid ester-amide in the form ofpale yellowish crystals of melting point l29 to C.

The compounds listed below were prepared analogously:

Struc ture Physical do '0 (me I 1 ing poin N l/ 20 11 M c14 s c H o l 2 5 IILO H 154-155 11 1/ cH N l "2" CH3 U cu v 3 161-168 1| H N CH3 (1 CH l 3 c u o H l 162-163 11 M cu -c 11 o I 2 5\|| fl 183184 14 cu 5 I 165-166 /W l 11 cu N CH S -141 c1-1 o N s -K n-C H 0 164-165 3 7 KN \P-O H2N CH3 -continued 4. A compound according to claim 1 which is O-ethyls t r u c m r a PM 5 i c a] do a ()-[7-methyl-pyrazolo-( l.5-a)-pyrimidin( 2 )-yl l-thionophosphoric acid ester-amide of the formula 5. A compound according to claim 1 which is 0- methyl-O-[5,7-dimethyl-pyrazolo-( -01)- Other Compounds which Cah he Shhlhlrly Prepared pyrimidin(2)-yl]-thionophosphoric acid ester-amide of ihchldei the formula O-isopropyl-O-[ 3-bromo-5-methyl-, O-n-butyl-O-l 3-chloro-5.7-dimethyl-. and

O-tertlbut l-O- 5-meth ll y l y v CH pyrazolo-( l.5-a)-pyrimidin(2)-yl]-thionophosphoric 3 acid ester-amides. (m 0 s It will be appreciated that the instant specification P 3 and examples are set forth by way of illustration and not limitation, and that various modifications and =3 N CH changes may be made without departing from the spirit i .2 3 and scope of the present invention.

What is claimed is: I. An O-alkyl-O-pyrazolopyrimidine-thionophosphoric acid ester-amide of the formula 6. A compound according to claim 1 which is O-ethyl- 0-[pyrazolo-( I .5-a)-pyrimidin( 2 )-yl l-thionophosphoric acid ester-amide of the formula P-O HZN c -11 o s in which 812R R is alkyl with l to 6 carbon atoms, R is hydrogen or halogen, and R and R each independently is hydrogen or methyl. A compoufld according to claim 1 which is 2. A compound according to claim 1 in which R is to 1201041 a thiono alkyl with 1 4carb0n atoms and R is h dro hl p py l py y Y c 0 phosphoric acid ester-amide of the formula rine or bromine.

3. A compound according to claim 1 which is O-npropyl-O- 7-methy1-pyrazolo-( l,5-a)-pyrimidin( 2 )-yl]- thionophosphoric acid ester-amide of the formula 3 7 \s ll N 

1. AN O-ALKYL-O-PYRAZOLOPYRIMIDINE-THIONOPHOSPHORIC ACID ESTER-AMIDE OF THE FORMULA
 2. A compound according to claim 1 in which R is alkyl with 1 -4 carbon atoms and R1 is hydrogen, chlorine or bromine.
 3. A compound according to claim 1 which is 0-n-propyl-0-(7-methyl-pyrazolo-(1,5- Alpha )-pyrimidin(2)-yl)-thionophosphoric acid ester-amide of the formula
 4. A compound according to claim 1 which is 0-ethyl-0-(7-methyl-pyrazolo-(1,5- Alpha )-pyrimidin(2)-yl)-thionophosphoric acid ester-amide of the formula
 5. A compound according to claim 1 which is 0-methyl-0-(5,7-dimethyl-pyrazolo-(1,5- Alpha )-pyrimidin(2)-yl)-thionophosphoric acid ester-amide of the formula
 6. A compound according to claim 1 which is 0-ethyl-0-(pyrazolo-(1,5- Alpha )-pyrimidin(2)-yl)-thionophosphoric acid ester-amide of the formula
 7. A compound according to claim 1 which is 0-n-propyl-0-(pyrazolo-(1,5- Alpha )-pyrimidin-(2)-yl)-thionophosphoric acid ester-amide of the formula 